Tankless Water Heater

6 Responses to “We Just Installed A Tankless Water Heater. When Faucets Are Turned On Inside Or Out Water Pipes Whistle. Why?”

1. Heather
   February 4th, 2010 @ 4:51 am

   a plumber would need to look at the problem before they could speculate b/c it could be any number of things. you should call back the plumber that installed the tankless water heater to see if it is something he did or to find out what exactly is going on.
   what brand of tankless water heater was installed?

2. gwg24/7
   February 4th, 2010 @ 9:54 am

   First, you say when water is run inside or out? Are you saying that it whistles when COLD water is running? If so, the plumber must have installed something else in your system as well. A tankless would only cause noise if you were running the HOT water. Many times a plumber will install a pressure regulator, or a check valve or a backflow preventer, and this new device may be making the noise. Always use an experienced and licensed professional when doing major jobs like tankless. If your plumber is he will come out at NO charge to you and should fix the problem. If not you may have to hire a licensed plumber to diagnose and fix the problem.

3. Dale M
   February 4th, 2010 @ 9:57 am

   Could be just you never noticed it before and a water heater provided enough water availability for it not to happen. Inside faucets aerators could have sediment from the water lines cause by the changing out other water heater and banging on the pipes. Clean those and the shower heads with CLR or other lime and rust remover. Outside faucets usually do not have an aerator so that is usual caused by the lack of speed of water coming out. You need make sure that when you changed out the water heater you got the water turned all the way on. What size of service do you have coming into the house? I have lived in older houses and the incoming service was low. One house had 3/8 of inch service. You can imagine the amount of water pressure we had on that small of service. What type of shut off? Do you have a round handle valve or a lever value? If you have round handle valve replace it with a full flow level valve. This will increase your water flow and hopefully the whistle. If you have a full flow lever valve the only thing you do is dig up the street and increase your service to the house. This is last resort because you have to have city shut water off and a plumber put in the service. Whistling is caused by the speed of water flowing through piping which is usually too small. A pressure reducing valve ( which I would never recommend) will help as will a general straightening out of the plumbing system. Whistling is most common at bends and tees in the pipe.

4. ozarkcab
   February 4th, 2010 @ 10:11 am

   they may not put any air expansion in the lines or you may not have ran all the air out yet that got in the lines while installing it. Find the highest faucet and let it run for a while.

5. __A_YAHO
   February 4th, 2010 @ 12:58 pm

   make sure the pipes at the heater are properly secured . vibration may be the cause of the noise

6. EagleWat
   February 4th, 2010 @ 1:35 pm

   Because your plumber didn’t finish the project.

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